<template>
    <view>
        <my-search @myClick="gotoSearch"></my-search>
        <view class="scroll-view-container">
            <!-- 左侧的滑动区 -->
            <scroll-view scroll-y="true" :style="{height: wh+'px'}" class="left-scroll-view ">
                <block v-for="(item,i) in cateList" :key="i">
                    <view :class="['left-scroll-view-item', i===active ? 'active' : '']" @click="activeChange(i)">
                        {{item.cat_name}}</view>
                </block>
            </scroll-view>
            <!-- 右侧的滑动区 -->
            <scroll-view scroll-y="true" :style="{height: wh+'px'}" :scroll-top="scrollTop">
                <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
                    <!-- 二级分类标题 -->
                    <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
                    <!-- 动态渲染三级分类 -->
                    <view class="cate-lv3-list">
                        <!-- 三级分类的循环项 -->
                        <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3"
                            @click="gotoGoodsList(item3)">
                            <!-- 三级分类图片 -->
                            <image :src="item3.cat_icon" mode=""></image>
                            <!-- 三级分类的文本标题 -->
                            <text>{{item3.cat_name}}</text>
                        </view>
                    </view>
                </view>
            </scroll-view>
        </view>
    </view>
</template>

<script>
    import MySearch from '@/components/my-search/my-search.vue'
    import badgeMix from '@/mixins/tabbar-badge.js'
    export default {
        mixins: [badgeMix],
        components: {
            MySearch
        },
        data() {
            return {
                //当前设备可用的高度
                wh: 0,
                // 获取分类的数据列表
                cateList: [],
                active: 0,
                cateLevel2: [],
                scrollTop: 0
            };
        },
        onLoad() {
            const wdInfo = uni.getWindowInfo()
            // console.log(wdInfo)
            this.wh = wdInfo.windowHeight - 50


            this.getCateList()
        },
        methods: {
            // 获取分类列表的数据
            async getCateList() {
                const {
                    data: res
                } = await uni.$http.get('/api/public/v1/categories')
                // console.log(res)
                if (res.meta.status !== 200) return uni.$showMsg()
                this.cateList = res.message


                // 为二级分类赋值
                this.cateLevel2 = res.message[0].children
            },
            activeChange(i) {
                this.active = i

                //重新为二级分类赋值
                this.cateLevel2 = this.cateList[i].children

                // 三级分类切换标签回到顶部
                this.scrollTop = this.scrollTop === 0 ? 1 : 0
            },
            // 跳转到商品列表页面
            gotoGoodsList(item) {
                uni.navigateTo({
                    url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
                })
            },
            gotoSearch() {
                uni.navigateTo({
                    url: '/subpkg/search/search'
                })
            }
        }
    }
</script>

<style lang="scss">
    .scroll-view-container {
        display: flex;


        .left-scroll-view {
            width: 120px;

            .left-scroll-view-item {
                background-color: #f7f7f7;
                line-height: 60px;
                text-align: center;
                font-size: 12px;
                color: black;

                // 激活的样式
                &.active {
                    position: relative;
                    background-color: #ffffff;

                    &::before {
                        content: ' ';
                        display: block;
                        width: 3px;
                        height: 30px;
                        background-color: #c00000;
                        position: absolute;
                        top: 50%;
                        left: 0;
                        transform: translateY(-50%);
                    }
                }
            }
        }
    }

    .cate-lv2-title {
        font-size: 12px;
        font-weight: bold;
        text-align: center;
        padding: 15px 0;
    }

    .cate-lv3-list {
        display: flex;
        flex-wrap: wrap;
        margin-bottom: 10px;

        .cate-lv3-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            width: 33.333333%;

            image {
                width: 60px;
                height: 60px;
            }

            text {
                font-size: 12px
            }
        }
    }
</style>